| Subject | English | Japanese |
| gen. | n third class | 三等 |
| gen. | n third class | ３等 news2 nf25 |
| gen. | adj-na third class | 三級 |
| gen. | n third-class | 丙種 |
| gen. | adj-no n third-class | 三流 ichi1 news2 nf26 |
| gen. | n item sent by third-class mail | 第三種郵便物 |
| gen. | n item sent by third-class mail | 第３種郵便物 |
| gen. | n third-class mail matter | 第三種郵便物 |
| gen. | n third-class mail matter | 第３種郵便物 |
| gen. | n third-class ticket | 赤切符 |